1 /* $NetBSD: armadillo9_iic.c,v 1.7 2012/10/27 17:17:46 chs Exp $ */ 2 3 /* 4 * Copyright (c) 2005 HAMAJIMA Katsuomi. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __KERNEL_RCSID(0, "$NetBSD: armadillo9_iic.c,v 1.7 2012/10/27 17:17:46 chs Exp $"); 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/kernel.h> 34 #include <sys/device.h> 35 #include <sys/mutex.h> 36 #include <dev/i2c/i2cvar.h> 37 #include <dev/i2c/i2c_bitbang.h> 38 #include <arm/ep93xx/epsocvar.h> 39 #include <arm/ep93xx/epgpiovar.h> 40 #include <evbarm/armadillo/armadillo9var.h> 41 42 #include "seeprom.h" 43 #if NSEEPROM > 0 44 #include <net/if.h> 45 #include <net/if_ether.h> 46 #include <dev/i2c/at24cxxvar.h> 47 #endif 48 49 struct armadillo9iic_softc { 50 struct i2c_controller sc_i2c; 51 kmutex_t sc_buslock; 52 int sc_port; 53 int sc_sda; 54 int sc_scl; 55 struct epgpio_softc *sc_gpio; 56 }; 57 58 static int armadillo9iic_match(device_t, cfdata_t, void *); 59 static void armadillo9iic_attach(device_t, device_t, void *); 60 61 static int armadillo9iic_acquire_bus(void *, int); 62 static void armadillo9iic_release_bus(void *, int); 63 static int armadillo9iic_send_start(void *, int); 64 static int armadillo9iic_send_stop(void *, int); 65 static int armadillo9iic_initiate_xfer(void *, uint16_t, int); 66 static int armadillo9iic_read_byte(void *, uint8_t *, int); 67 static int armadillo9iic_write_byte(void *, uint8_t, int); 68 69 static void armadillo9iic_bb_set_bits(void *, uint32_t); 70 static void armadillo9iic_bb_set_dir(void *, uint32_t); 71 static uint32_t armadillo9iic_bb_read_bits(void *); 72 73 CFATTACH_DECL_NEW(armadillo9iic, sizeof(struct armadillo9iic_softc), 74 armadillo9iic_match, armadillo9iic_attach, NULL, NULL); 75 76 static struct i2c_bitbang_ops armadillo9iic_bbops = { 77 armadillo9iic_bb_set_bits, 78 armadillo9iic_bb_set_dir, 79 armadillo9iic_bb_read_bits, 80 { 0, 0, 0, 0 } /* set in attach() */ 81 }; 82 83 int 84 armadillo9iic_match(device_t parent, cfdata_t cf, void *aux) 85 { 86 return 2; 87 } 88 89 void 90 armadillo9iic_attach(device_t parent, device_t self, void *aux) 91 { 92 struct armadillo9iic_softc *sc = device_private(self); 93 struct i2cbus_attach_args iba; 94 #if NSEEPROM > 0 95 struct epgpio_attach_args *ga = aux; 96 #endif 97 mutex_init(&sc->sc_buslock, MUTEX_DEFAULT, IPL_NONE); 98 99 sc->sc_port = ga->ga_port; 100 sc->sc_sda = ga->ga_bit1; 101 sc->sc_scl = ga->ga_bit2; 102 sc->sc_gpio = (struct epgpio_softc *)parent; 103 104 armadillo9iic_bbops.ibo_bits[I2C_BIT_SDA] = (1<<sc->sc_sda); 105 armadillo9iic_bbops.ibo_bits[I2C_BIT_SCL] = (1<<sc->sc_scl); 106 armadillo9iic_bbops.ibo_bits[I2C_BIT_OUTPUT] = sc->sc_sda; 107 armadillo9iic_bbops.ibo_bits[I2C_BIT_INPUT] = 0; 108 109 sc->sc_i2c.ic_cookie = sc; 110 sc->sc_i2c.ic_acquire_bus = armadillo9iic_acquire_bus; 111 sc->sc_i2c.ic_release_bus = armadillo9iic_release_bus; 112 sc->sc_i2c.ic_send_start = armadillo9iic_send_start; 113 sc->sc_i2c.ic_send_stop = armadillo9iic_send_stop; 114 sc->sc_i2c.ic_initiate_xfer = armadillo9iic_initiate_xfer; 115 sc->sc_i2c.ic_read_byte = armadillo9iic_read_byte; 116 sc->sc_i2c.ic_write_byte = armadillo9iic_write_byte; 117 118 iba.iba_tag = &sc->sc_i2c; 119 120 epgpio_in(sc->sc_gpio, sc->sc_port, sc->sc_sda); 121 epgpio_out(sc->sc_gpio, sc->sc_port, sc->sc_scl); 122 epgpio_set(sc->sc_gpio, sc->sc_port, sc->sc_scl); 123 124 printf("\n"); 125 126 config_found_ia(self, "i2cbus", &iba, iicbus_print); 127 128 #if NSEEPROM > 0 129 /* read mac address */ 130 /* XXX This should probably be done elsewhere, earlier in bootstrap. */ 131 if (seeprom_bootstrap_read(&sc->sc_i2c, 0x50, 0x00, 128, 132 armadillo9_ethaddr, ETHER_ADDR_LEN) != 0) { 133 printf("%s: WARNING: unable to read MAC address from SEEPROM\n", 134 device_xname(self)); 135 } 136 #endif 137 } 138 139 int 140 armadillo9iic_acquire_bus(void *cookie, int flags) 141 { 142 struct armadillo9iic_softc *sc = cookie; 143 144 /* XXX What should we do for the polling case? */ 145 if (flags & I2C_F_POLL) 146 return 0; 147 148 mutex_enter(&sc->sc_buslock); 149 return 0; 150 } 151 152 void 153 armadillo9iic_release_bus(void *cookie, int flags) 154 { 155 struct armadillo9iic_softc *sc = cookie; 156 157 /* XXX See above. */ 158 if (flags & I2C_F_POLL) 159 return; 160 161 mutex_exit(&sc->sc_buslock); 162 } 163 164 int 165 armadillo9iic_send_start(void *cookie, int flags) 166 { 167 return i2c_bitbang_send_start(cookie, flags, &armadillo9iic_bbops); 168 } 169 170 int 171 armadillo9iic_send_stop(void *cookie, int flags) 172 { 173 return i2c_bitbang_send_stop(cookie, flags, &armadillo9iic_bbops); 174 } 175 176 int 177 armadillo9iic_initiate_xfer(void *cookie, i2c_addr_t addr, int flags) 178 { 179 return i2c_bitbang_initiate_xfer(cookie, addr, flags, 180 &armadillo9iic_bbops); 181 } 182 183 int 184 armadillo9iic_read_byte(void *cookie, uint8_t *bytep, int flags) 185 { 186 return i2c_bitbang_read_byte(cookie, bytep, flags, 187 &armadillo9iic_bbops); 188 } 189 190 int 191 armadillo9iic_write_byte(void *cookie, uint8_t byte, int flags) 192 { 193 return i2c_bitbang_write_byte(cookie, byte, flags, 194 &armadillo9iic_bbops); 195 } 196 197 void 198 armadillo9iic_bb_set_bits(void *cookie, uint32_t bits) 199 { 200 struct armadillo9iic_softc *sc = cookie; 201 202 if (bits & (1 << sc->sc_sda)) 203 epgpio_set(sc->sc_gpio, sc->sc_port, sc->sc_sda); 204 else 205 epgpio_clear(sc->sc_gpio, sc->sc_port, sc->sc_sda); 206 207 if (bits & (1 << sc->sc_scl)) 208 epgpio_set(sc->sc_gpio, sc->sc_port, sc->sc_scl); 209 else 210 epgpio_clear(sc->sc_gpio, sc->sc_port, sc->sc_scl); 211 } 212 213 void 214 armadillo9iic_bb_set_dir(void *cookie, uint32_t bits) 215 { 216 struct armadillo9iic_softc *sc = cookie; 217 218 if(bits) 219 epgpio_out(sc->sc_gpio, sc->sc_port, sc->sc_sda); 220 else 221 epgpio_in(sc->sc_gpio, sc->sc_port, sc->sc_sda); 222 } 223 224 uint32_t 225 armadillo9iic_bb_read_bits(void *cookie) 226 { 227 struct armadillo9iic_softc *sc = cookie; 228 uint32_t bits = 0; 229 230 bits |= epgpio_read(sc->sc_gpio, sc->sc_port, sc->sc_sda) << sc->sc_sda; 231 bits |= epgpio_read(sc->sc_gpio, sc->sc_port, sc->sc_scl) << sc->sc_scl; 232 233 return bits; 234 } 235